From 20431706a863f92cb37dc512fef6e48d192aaf2c Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:11:38 +0200
Subject: Merging upstream version 1.66.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 library/core/benches/iter.rs | 27 +++++++++++++++++++++++++++
 library/core/benches/lib.rs  |  1 +
 2 files changed, 28 insertions(+)

(limited to 'library/core/benches')

diff --git a/library/core/benches/iter.rs b/library/core/benches/iter.rs
index 0abe20e4c..38887f29a 100644
--- a/library/core/benches/iter.rs
+++ b/library/core/benches/iter.rs
@@ -1,4 +1,6 @@
 use core::iter::*;
+use core::mem;
+use core::num::Wrapping;
 use test::{black_box, Bencher};
 
 #[bench]
@@ -363,6 +365,13 @@ fn bench_partial_cmp(b: &mut Bencher) {
     b.iter(|| (0..100000).map(black_box).partial_cmp((0..100000).map(black_box)))
 }
 
+#[bench]
+fn bench_chain_partial_cmp(b: &mut Bencher) {
+    b.iter(|| {
+        (0..50000).chain(50000..100000).map(black_box).partial_cmp((0..100000).map(black_box))
+    })
+}
+
 #[bench]
 fn bench_lt(b: &mut Bencher) {
     b.iter(|| (0..100000).map(black_box).lt((0..100000).map(black_box)))
@@ -391,3 +400,21 @@ fn bench_trusted_random_access_adapters(b: &mut Bencher) {
         acc
     })
 }
+
+/// Exercises the iter::Copied specialization for slice::Iter
+#[bench]
+fn bench_copied_array_chunks(b: &mut Bencher) {
+    let v = vec![1u8; 1024];
+
+    b.iter(|| {
+        black_box(&v)
+            .iter()
+            .copied()
+            .array_chunks::<{ mem::size_of::<u64>() }>()
+            .map(|ary| {
+                let d = u64::from_ne_bytes(ary);
+                Wrapping(d.rotate_left(7).wrapping_add(1))
+            })
+            .sum::<Wrapping<u64>>()
+    })
+}
diff --git a/library/core/benches/lib.rs b/library/core/benches/lib.rs
index a6c174d2f..1e462e3fc 100644
--- a/library/core/benches/lib.rs
+++ b/library/core/benches/lib.rs
@@ -4,6 +4,7 @@
 #![feature(int_log)]
 #![feature(test)]
 #![feature(trusted_random_access)]
+#![feature(iter_array_chunks)]
 
 extern crate test;
 
-- 
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